im trying to figure out a good port area to aim for for a 12" TC9 when tuning to 28-30hz. max enclosure dimensions are 16T 28W 14D, which nets me about 2.9 cubes gross. not sure what actual driver displacement is so ive been using .12 just to be on the safe side. so far ive come up with 14T 28W 14D with a 12.5X1.5" port 28" long. this gives me 1.98 cubes net with a tuning of ~28hz, a 1:8.33 port ratio and 18.75" of port area. im thinking i need more port area, but the only way i can do that is to go to 16" tall and make a 14.5X1.5" port 28" long which puts my port ratio over 1:9.
any help would be appreciated. getting the wood cut tomorrow.